Abstract
Bacterial speck (Pseudomonas syringae pv. tomato) is considered one of the major diseases of tomato crop worldwide and alternative methods to control it are desirable. The objective of this study was to evaluate the effect of essential oils (EOs) on P. syringae pv. tomato strain ufv-1 growth, in controlling bacterial speck in tomato plants, as well as to find the best application time of the EOs. The EOs used in this study were thyme (TH), eucalyptus (EU), tea tree (TT), clove (CL), cinnamon (CN), citronella (CI), and lemon grass (LE). An in vitro test using EOs were conducted to verify the ufv-1 inhibition, and two tests were carried out in a greenhouse to evaluate the effect of EOs before and after inoculation with Pst. Inhibition zones were observed for EU, CI, CL, and CN at a concentration of 1%. Plants pre-treated with EOs showed lower disease severity than that in plants post-treated with EOs (P<0.05), whereas higher efficacy was observed using acibenzolar-S-methyl and CI (91 and 83%, respectively). Regarding post-treatment, TT, TH, CI, EU, LE, and commercial fungicide, resulted in reducing disease severity by 8 to 40% compared to control (water). Results from this study showed the potential use of EOs in controlling bacterial speck in tomato and suggest the induced resistance as the major mode of action.
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Claims 6
Claim · model-written summary
Eucalyptus, citronella, clove, and cinnamon oils at 1% inhibited the pathogen in vitro.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- EU, CI, CL, and CN at a concentration of 1%e0
- Interactor
- P. syringae pv. tomato
Pseudomonas syringae pv. tomatoe1pathogen - Outcome
- Inhibition zonese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibition zones were observed for EU, CI, CL, and CN at a concentration of 1%.”
e1“P. syringae pv. tomato strain ufv-1 growth”
t0“tomato crop”
Claim · model-written summary
Pre-treatment with essential oils produced lower tomato disease severity than post-treatment.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- pre-treated with EOse0
- Outcome
- disease severitye0
- Direction
- lowere0
- Comparator
- post-treated with EOse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants pre-treated with EOs showed lower disease severity than that in plants post-treated with EOs (P<0.05)”
t0“tomato crop”
Claim · model-written summary
Acibenzolar-S-methyl pre-treatment had 91% efficacy against bacterial speck.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- acibenzolar-S-methyle0
- Outcome
- efficacye0
- Direction
- highere0
- Value
- 91e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher efficacy was observed using acibenzolar-S-methyl and CI (91 and 83%, respectively)”
t0“tomato crop”
Claim · model-written summary
Citronella pre-treatment had 83% efficacy against bacterial speck.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher efficacy was observed using acibenzolar-S-methyl and CI (91 and 83%, respectively)”
t0“tomato crop”
Claim · model-written summary
Post-treatment with tea tree, thyme, citronella, eucalyptus, lemon grass oils or commercial fungicide reduced disease severity by 8 to 40% versus water.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- TT, TH, CI, EU, LE, and commercial fungicidee0
- Outcome
- disease severitye0
- Direction
- reducinge0
- Value
- 8 to 40%e0
- Comparator
- control (water)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regarding post-treatment, TT, TH, CI, EU, LE, and commercial fungicide, resulted in reducing disease severity by 8 to 40% compared to control (water).”
t0“tomato crop”
Claim · model-written summary
The authors proposed induced resistance as the main mode of action of essential oils.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- essential oils (EOs)e1
- Outcome
- induced resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggest the induced resistance as the major mode of action”
e1“essential oils (EOs)”
t0“tomato crop”
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